KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 387 



1877. Anchylonyx, TH. STREETS. »Contributions to the Natural History 



of the Hawaiian and Fanning Islands 

 and Lower California'). Bulletin of 

 the United States National Museum. 

 1877. N:o 7, p. 130. 



The type for the genus Phronimella was described in 1862 by Claus under the 

 name Phronima elongata. As far as I know he did not give any other generic diagnosis of 

 Phronimella than the few words accompanying that name in the second edition of his 

 »Grundzuge der Zoologie», till in 1879, when he published his excellent memoir, »Der 

 Organismus der Phronimiden». 



His diagnosis of 1872, repeated in 1875, runs: 



»Das funfte Beinpaar endet mit langgestreckter Greifhand. Drittes Beinpaar sehr lang. 

 Nur zwei Paare stilformiger Caudalgriffel. Vorderfiihler des Mannchens mit stark em Schaft und 

 vielgliedriger Geissel.» 



In 1877 Th. Streets described a Phronimella under the name of Anchylonyx ha- 

 matus, n. g. et sp., which in 1882 he identified with Phronimella elongata, Claus. 

 His generic description runs thus: 



»Head moderately large, broad and rounded at the top, tapering inferiorly to the oral 

 apparatus, and excavated in front. Eyes on the lateral and dorsal surfaces of the head. Both 

 pairs of antenna? present, long; base of the superior pair long and stout, three-jointed; inferior 

 pair slender, four-jointed; flagellum very attenuated and elongated. Thorax broad, somewhat 

 compressed; segments six. Abdomen narrow. The gnathopoda not subchelate, nor much reduced 

 in size, when compared with the following feet; the first and second pairs of thoracic feet long, 

 slender; carpus and meros linear. The third pair enlarged; carpus and meros dilated, with the 

 anterior margin armed with teeth; propodus flexes on the carpus, impinging against the teeth 

 on its anterior margin; dactylus fused with the propodus. The fourth and fifth pairs of feet sub- 

 equal, shorter than the preceding. The three posterior pairs of abdominal appendages biramous, 

 lanceolate; rami pointed.» 



In 1879 Claus gave the following generic diagnosis: 



»Korper sehr gestreckt, uberaus pellucid, mit nur 2 Paar stilformiger Uropoden. Kopf 

 kurz, mit hohem, gewolbtem Scheitel, Scheitelmundachse sehr verlangert. Die zwei vordern 

 Brustseginente ohne Grenzen verschmolzen. Mandibeltaster fehlen audi dem Mannchen. Zunge 

 der Unterlippe (Maxillarfusspaar) auf einen warzenformigen Hocker reducirt. Die beiden Gnatho- 

 podenpaare schmachtig mit schwacher (zusammengesetzter) Greifhand. Das dritte Beinpaar etwas 

 weniger, das vierte stark verlangert. Das funfte Beinpaar endet mit sehr langgestreckter (zu- 

 sammengesetzter) Greifhand. Drei Paare von Kiemenschlauehen am 4., 5. und 6. Brustringe.» 



In 1882 Streets gave the following new diagnosis: 



»The shape of the head and antennae, and the general form of the thorax and abdomen 

 very similar to Phronima. The third pair of thoracic feet long — much longer than the succeed- 

 ing pair. The fifth pair enlarged, and used for prehension; the extremity, or claw, resembling that 

 of the. Squilla — the movable finger (fifth joint) flexing against the anterior aspect of the palm, 

 which is furnished with teeth. Three pairs of styliform caudal appendages; the second, or middle, 

 pair short, or rudimentary. 



Sexual differences. Males smaller than the females, and more robust. In the females the 

 second pair of caudal appendages are rudimentary, almost obsolete; in the males well developed." 



